Owner`s manual

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* = All apertures available for use ? = untested (data from beta eld reports)
EF Lens Narrowest Aperture
No Speedlite on
camera’s radio
Narrowest Aperture
Speedlite on
camera’s radio
Narrowest Aperture,
No Speedlite on
camera’s radio HSS
shutter speeds
Narrowest Aperture
Speedlite on camera’s
radio HSS shutter
speeds
EF 50mm f/1.4 f/22* f/8 f/8 f/7.1
EF 50mm f/2.5 Macro f/32* f/14 f/14 f/14
EF 70-300mm f/4-5.6
IS USM
f/32* f/32* f/25 f/25
EF 24-70mm f/2.8 L
USM
f/22* f/14 f/13 f/10
EF 24-105mm f/4 L
IS USM
f/22* f/22* f/22* f/22*
EF 28-135mm f/3.5-
1.6 IS
f/22* f/22* f/22* f/22*
EF 85mm f/1.8 USM f/22* ? ? ?
EF 16-35mm f/2.8 L
(II?) USM
f/22* ? ? ?
EF 135mm f/2 L USM f/29 ? ? ?
EF 70-200mm f/4L
USM
f/32* ? ? ?
NOTE: Any Speedlite, including the ST-E2, in any mode when on the camera’s radio can cause this behavior. A fully manual ash,
but not a Speedlite even in manual mode, can work. 3rd party E-TTL II compatible ashes have not been tested and may produce
undesirable behavior.
• FEC control from the ash is now implemented for the FlexTT5 when used as a transmitter.
• FEL and FEC operation on a 5D Mark II when using a FlexTT5 on the camera has been improved.
• AF-Assist operation greatly improved in several scenarios including on specic cameras like the 5D Mark II and when using
the FlexTT5 as a transmitter on the camera. Also corrected a situation where AF-Assist would stay on during the exposure
and be visible in the image.
• A situation where ash recharge/recycle would be delayed has been corrected.